Concentration Camp Sobibor, air mail letter Hilversum-New York 25.VIII.1941, German Frankfort censor, addressee unknown Not in directory/ Station W, with 3x retour, US censor label and stamp This article has been held/ by the office of censorship, after the war returned to the Netherlands, could not be delivered because sender and his family (fam. Guenebaum) did not survive Sobibor. Opened on the right